chore: remove src/types.ts from knip entry configuration

[Pixel998]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

This PR configures knip to properly recognize public API types in src/types.ts files so they aren't incorrectly flagged as unused exports. These types are meant for external consumption by package users, even if they're not used internally within our codebase.

What changes did you make? (Give an overview)

Added src/types.ts to the knip entry configuration for four packages that export public types:

• @eslint/config-array
• @eslint/config-helpers
• @eslint/migrate-config
• @eslint/plugin-kit

The @eslint/object-schema package already had this configuration.

Related Issues

#351

Is there anything you'd like reviewers to focus on?

[fasttime]

I believe knip is already recognizing src/types.ts files; otherwise it would flag them as unused. The issue in #351 seems to be an unreferenced type definition. I’ve added a comment on the PR with a possible fix.

[Pixel998]

Sorry, I meant this knip issue: https://github.com/eslint/rewrite/actions/runs/20762026304/job/59619177443

[fasttime]

Sorry, I meant this knip issue: https://github.com/eslint/rewrite/actions/runs/20762026304/job/59619177443

That's the same error. It will no longer appear now that CustomRuleVisitorWithExit is being reexported.

[Pixel998]

You're right. My point was that knip needs explicit re-exports to avoid flagging types. I originally opened this PR thinking we'd need a structural fix (like /types exports or the eslint/markdown dummy file approach) that would require telling knip about src/types.ts.

Since we've gone with the re-export approach instead, these configuration entries are no longer needed. I've updated the PR to remove all of them.

[fasttime]

LGTM, thanks!